Apparatus For (Meth) Acrylic Acid Production And Process For Producing (Meth) Acrylic Acid
a technology of acrylic acid and apparatus, which is applied in the preparation of carboxylic compounds, indirect heat exchangers, lighting and heating apparatus, etc., can solve the problems of increasing pressure in the reactor, clogging of the heat exchanger, and developing difficulties in continuing a usual operation, etc., to achieve stable and continuous operation
Inactive Publication Date: 2008-01-24
YAMAGISHI MASAHIKO +2
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
[0009] Accordingly, an object of the present invention is to provide a method which eliminates disadvantages of the prior art that is, a method which allows heat recovery from a reaction gas when (meth)acrylic acid in the reaction gas discharged from a reactor is supplied to an absorption tower to be recovered as a (meth)acrylic acid solution, and enables a stable and continuous operation even when a heat exchanger is clogged.
[0010] According to the present invention, in recovering acrylic acid or methacrylic acid hereinafter each or both of acrylic acid and methacrylic acid are collectively described as “(meth)acrylic acid”) as a (meth)acrylic acid solution by cooling a reaction gas discharged from a reactor using a heat exchanger and supplying the cooled reaction gas to an absorption tower, the heat exchanger for cooling the reaction gas is provided with a by-pass tube which connects an inlet and an outlet of the heat exchanger, and an inner pressure of the reactor is maintained at a predetermined value to prevent reduction in production of (meth)acrylic acid due to reduction in flow rate of a raw material gas to the reactor by gradually opening a valve provided in the by-pass tube when a pressure in the reactor increases and production of (meth)acrylic acid decreases due to clogging of the heat exchanger.
Problems solved by technology
The reaction gas contains compounds such as phthalic acid and maleic acid in this case, and those compounds adhere to the heat exchanger during a continuous operation, leading to clogging of the heat exchanger.
When the heat exchanger is clogged, a pressure in the reactor increases, developing difficulties in continuing a usual operation.
Such clogging of the heat exchanger develops difficulties in a stable operation of a production apparatus for producing (meth)acrylic acid and reduces productivity of (meth)acrylic acid.
However, nothing is described regarding adherence of a deposit to a heat exchanger in an apparatus provided with the heat exchanger for cooling a reaction gas supplied to an absorption tower.
Furthermore the technique for removing a deposit in a heat exchanger or the technique for preventing adherence of a deposit to a heat exchanger may require a large scale apparatus for producing (meth)acrylic acid or complicated processes or may result in limited cooling of a reaction gas in the heat exchanger.
Method used
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example 1
[0113] Acrylic acid was produced through a vapor-phase catalytic oxidation reaction of propylene using the production apparatus shown in FIG. 1. The multitube reactor shown in FIG. 3 was used as the reactor 1.
[0114] A catalyst composed of a mixed oxide having an atomic ratio of Mo:Bi:Co:Ni:Fe:Na:Mg:B:K:Si=12:5:2:3:0.4:0.1:0.4:0.2:0.08:24 disclosed in JP 06-013096 B as an oxidation catalyst for oxidizing propylene to produce mainly acrolein was packed in reaction tubes of a first stage (hereinafter referred to as “first reactor”) of the multitube reactor.
[0115] On the other hand, a catalyst composed of a mixed oxide having an atomic ratio of Mo:V:Nb:Sb:Sn:Ni:Cu:Si=35:7:3:100:3:43:9:80 disclosed in JP 11-035519 A as a catalyst for oxidizing acrolein to produce acrylic acid was packed in reaction tubes of a second stage (hereinafter, referred to as “second reactor”) of the multitube reactor.
[0116] Liquefied propylene was passed through an evaporator and was supplied to the reactor 1...
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Abstract
(Meth)acrylic acid is produced using a reactor (1) through a vapor-phase catalytic oxidation reaction of propane or the like in a raw material gas, and the obtained reaction gas is distributed to a heat exchanger (20) and an absorption tower (30). Heat energy is recovered from the reaction gas supplied to the heat exchanger (20), and the reaction gas cooled in the heat exchanger (20) and the reaction gas distributed to the absorption tower (30) are supplied to the absorption tower (30). (Meth) acrylic acid is recovered from the reaction gas in an absorbing liquid, to thereby produce (meth) acrylic acid. The reaction gas is distributed to the heat exchanger (20) and the absorption tower (30) according to a pressure of the raw material gas at an inlet of the reactor (1). The present invention allows heat recovery from the reaction gas and a stable and continuous operation even when the heat exchanger for heat recovery is clogged.
Description
TECHNICAL FIELD [0001] The present invention relates to an apparatus for and a method of producing (meth)acrylic acid through a vapor-phase catalytic oxidation reaction of propane, propylene, isobutylene, or (meth)acrolein. The present invention more specifically relates to an apparatus and a method for producing (meth)acrylic acid for preventing reduction in production of (meth)acrylic acid due to clogging of a heat exchanger provided between a reactor and an absorption tower, in recovering (meth)acrylic acid from a reaction gas discharged from the reactor in the absorption tower. BACKGROUND ART [0002] A process for producing (meth)acrylic acid usually employs a method involving: producing (meth)acrylic acid through a vapor-phase catalytic reaction of propane, propylene, isobutylene, or (methacrolein; supplying a reaction gas containing the produced (meth)acrylic acid to an absorption tower to bring the reaction gas into contact with an absorbing liquid such as water; and recoverin...
Claims
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IPC IPC(8): C07C51/00B01J19/00F28D21/00C07B61/00C07C51/21C07C51/215C07C51/235C07C51/25C07C51/42C07C57/05C07C57/055
CPCB01J8/067B01J2208/00053B01J2208/00061B01J2208/00212B01J2208/00221C07C51/215B01J2208/00256C07C57/04Y02P20/10Y02P20/50
Inventor YAMAGISHI, MASAHIKOYADA, SHUHEIJINNO, KIMIKATSU
Owner YAMAGISHI MASAHIKO
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